Abstract
Petrophysical properties (wet bulk density, porosity, P-wave velocity) are used to predict biogenic silica contents along a seismic reflection profile that ties two well sites, 1095 and 1096, drilled by Ocean Drilling Program (ODP) Leg 178 on sediment drifts on the Pacific continental margin of the Antarctic Peninsula. The biogenic silica contents along the seismic reflection profile were estimated on the basis of three hypotheses about petrophysical properties distributions in the two boreholes and statistical relationships between biogenic silica and other petrophysical properties, which were established on various sediment layers within the boreholes. Our study demonstrates the possibility to reliably predict the distribution of biogenic silica in the sub-seabed sediments if seismic data processed with amplitude preservation are used and statistical relations are considered. We conclude that the statistical extrapolation of biogenic silica content along seismic reflection profiles tied to borehole data is an efficient tool to quantify the amounts of silica undergoing crystalline transformation, which may have strong implications for submarine slope destabilisation.
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Acknowledgments
This study has been funded by the EC-FPV Research and Training Network EURODOM (European Deep Ocean Margins: a new training-through-research frontier). Thanks to Hampson-Russell, Calgary, Alberta, Canada for making the software available. Miquel Canals and Claus-Dieter Hillenbrand are gratefully acknowledged for their constructive comments.
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Neagu, R.C., Tinivella, U., Volpi, V. et al. Estimation of biogenic silica contents in marine sediments using seismic and well log data: Sediment Drift 7, Antarctica. Int J Earth Sci (Geol Rundsch) 98, 839–848 (2009). https://doi.org/10.1007/s00531-008-0315-2
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DOI: https://doi.org/10.1007/s00531-008-0315-2